【摘要】 采用碱液萃取法去除竹焦油中碱不溶性物质,制备竹焦油精制液;然后以此替代部分苯酚与甲醛聚合,制备PF(酚醛树脂)胶粘剂。采用正交试验法确定了精制竹焦油的最佳工艺条件,并采用GC/MS(气质联用)法分析其化学组成。研究结果表明:精制竹焦油的最佳工艺条件为萃取时间24 h、碱液浓度15.0%和m(碱液):m(竹焦油)=1.00:1;此时体系的萃取得率为54.09%、萃取液含水率为63.30%、萃取液与甲醛的反应活性为0.31 mol/100 g;精制竹焦油中酮类物质的相对含量从8.53%降至1.22%,其他物质的相对含量从33.40%降至24.30%,而酚类物质的相对含量比竹焦油原液提高了19.51%,并且酚类物质的反应活性优于竹焦油原液。更多还原

【Abstract】 The insoluble compounds of lye in bamboo tar were removed by lye extraction method,so a bamboo tar liquor was refined.Then,with the refined liquor as substitute of part phenols,a PF(phenol-formaldehyde resin)adhesive was prepared by polymerization between the substitute and formaldehyde.The optimal process conditions of refining bamboo tar were determined by orthogonal experiment,and its chemical compositions were analysed by GC/MS(gas chromatography-mass spectrometry).The research results showed that the optimal process conditions of refining bamboo tar were obtained when the extraction time was 24 h,concentration of lye was 15.0%,and mass ratio of m(lye):m(bamboo tar) was 1.00:1.Here,the extraction yield was 54.09%,moisture content in extraction liquor was63.30%,and reaction activity between extraction liquor and formaldehyde was 0.31 mol/100 g for system.The relative contents of various ketone compounds in refining bamboo tar were decreased from 8.53%to 1.22%,and the relativecontents of other compounds in refining bamboo tar were decreased from 33.40%to 24.30%,but the relative contents of plienolic compounds in refining bamboo tar were 19.51%more than those in raw bamboo tar,and the reaction activity of phenolic! compounds in refining bamboo tar was better than that in raw bamboo tar.更多还原